The Geschwind-Behan hypothesis, that migraine is more common among lef
t-handed patients, was tested in 320 migraine sufferers. The frequency
of left-handedness was also assessed in 68 tension headache patients
and compared to that in 140 healthy controls. No significant differenc
es were observed. This study failed to support the association between
migraine, tension headache and left-handedness using the IHS classifi
cation of headache.